The Pakistani Taliban is now on the international terrorism blacklist as the U.S. launches a broad legal offensive against the group.

Secretary of State Hillary Clinton said the group threatens U.S. national security, especially since their involvement in the failed May 1 Time Square car bombing.

The U.S. also blamed the Pakistani Taliban for planning a 2009 suicide bombing in Afghanistan that killed seven CIA employees.

By being on the blacklist, the Pakistani Taliban is now designated by U.S. law as a foreign terrorist organization. The move also freezes any assets the group and its leaders may have in U.S. jurisdictions, and makes it illegal for Americans to provide support.

CBN News Terrorism Analyst Erick Stakelbeck said the move was long overdue.

"I think there are two questions here. One -- why did it take so long to put the Pakistani Taliban on that terrorists list? This is a group that's directly threatened the U.S. for years now," he said. "Number two -- why is the Afghan Taliban, the Pakistani's sister organization, still not on that terror list?"

Meanwhile, the Taliban is disrupting relief efforts in Pakistan. Millions of flood victims there still need emergency aid. But Pakistani Taliban leaders have threatened international aid workers, saying "foreign blood" is not welcome in their country.